couple visited a section of arlington national cemetery including graves of many lost from wars in iraq and afghanistan. >> members of congress joined together to sing "god bless america". the former and current speaker reflected on the anniversary. >> time will never diminish the courage of the first responders. >> we are americans. and this is our place. >> members of congress commemorated the anniversary with a moment of silence. >> speakers read names of the passengers and crew of united airlines flight 93 in shanksville, pennsylvania today, vice president biden saluted heroism of those aboard the jetliner. a group of passengers overpowered the hijackers. the plan flew towards washington, d.c. that crashed into a field. >> we saw touching commemorations here in the bay area in, san francisco, the fire chief, mayor, and police chief led a morning ceremony at station 7. >> there are names of the firefighters and paramedics were read outloud as part of the annual fire department tradition and all 43 fire stations paused for this tribute. >> there is an observeance in union city and spo